Valve seating tool and method



April 1942- J. D. LANGDON VALVE SEATING TOOL AND METHOD Filed Dec.- 18, 1939 Patented Apr. 14, 1942 UNlTED STATES FATENT OFFICE VALVE SEATING TOOL AND METHOD Jesse D. Langdon, Los Angeles, Calif. Application December 18, 1939, Serial No. 309,893

2 Claims.

The present invention relates to improvements in valves and seats therefor, and has for its primary object the production of a valve mechanism tending to eliminate the usual valve and seat trouble due to friction, wear, wire-cutting or the like, usually inherent in conventional valve assemblies.

A further object is to provide a valve structure capable of manual operation with a minimum of effort, and;

A valve seating method for manufacturing valves embodying the elements and principles set forth herein; also applicable to reseating valves already installed for use.

A valve seating set for cooperable use to support the method and set consisting of a special form of valve and seating tool.

To prolong the life of valves usually considered worn out, by providing a valve and seat subject to a minimum of wear and making a new seat to suit the special valve, as shown.

Other and further objects of the invention are disclosed by the following specification: It is specifically understood, the reduction to practice as described and shown is for the purpose of illucidation and illustration only any departure in structure may be used conforming with the practice disclosed by the scope of what is claimed.

Of the drawing:

Fig. 1 shows a valv assembly cut away partly in section after the set has been used and the method applied.

Fig. 2 is a fragmentary portion of the valve casing illustrating the valve seat after the method has been applied.

Fig. 3 is a valve providing a resilient cushion moulded about a double flanged core.

Fig. 4 is an elevation of theseating tool with seating portion I representing the seat cutting portion separated from the tool shank.

The set and method as of Fig. 1 are applied as follows: The valve assembly consists of; casing A having an inlet B the upper end ofwhich has been seated with tool 5 of Fig. 4, an outlet C, a valve stem D threaded into the barrel E and held by packing nut F, the valve I of Fig. 3 having split shank 2 thereof pivotally inserted into the lower end of stem D, the cushion portion of valve I being substantially concave adjacent to the periphery of the forwardly projecting flexible resilient edge shown inserted into the second step of the cylindrical seat barrel within the limits of the multiple seats shown as formed between cal and DUI, Fig. 2.

It is usually preferable to have a shoulder the upper bore against the deposed to contact the forwardly projecting end or edge of valve I to limit the depth to which valve I can be inserted, and further act to compress the cushioned portion and expand the same against the barrel cal, bbl of the seat. However, an object in the set and method is to provide means to permit the insertion of the resilient portion of the valve I into the seat barrel, like a cork in a bottle; the forwardly projecting edge contacting the bottom for-med by one of the steps to expand valve I radially outward. Theconcavity in the end of the valve I providing a resilient thin edge subject to expansion against the inner wall of a bore. By the application of fiuidpressure the valve l tends to expand and seal the valve against leakage. If a metal valve is used it must be made with a deep cup shape having a very thin forwardly projecting wall or lip to offer a sufiiciently flexible and resilient structure to serve the objective purposes supra.

The detail of the multiple step seat shown between an] and bb'l includes a pronounced radius for the upper edge of the first step cal and a slight radius for the upper edge of each succeeding step, to insure a guided alignment of the various sized valves that may be used to fit any of the several bores of the seat. However, one of the advantages obtained by the invention is the standardization of valve seats to fit a single size of valve, for example, most faucets or shutoff valves using the conventional seats are made for /4" to /2" ports being enlarged by the use of tool 5 standardizing the bore so that regardless of the size within this size range above a half inch washer as of enlarged Fig. 3, will fit in first step between cal and DUI, Fig. 2. Even though there are no steps provided, the advantages of the set and method are still obtained.

The valve I of Fig. 3 is enlarged to show detail, the thick cushioned portion disposed between the upper flange of eyelet 3 and the lower flange a4. 4 constitutes the split portion which is designed to secure the shank 2 and the relatively heavy cushioned valve portion, as at I, between the flanges to anchor the elements of structure together. Between the upper inner circumference of the flange as at 3, and the wall of the shank 2 a groove is provided to carry plastic lubricant which is sealed and held by the impingement of its flange as at 3 against the end of the valve operating stem D, the lower end of which is usually recessed but may be flat if preferred without detriment to the effectiveness of the set or method. I

stem [for which a-screw contour I of tool 5 Fig. 4 having entered the valve inlet B until the shoulder a! acts as a stop to limit the depth of the seat between aa'Land 12121. Any cuttingjshould bewashed out by allowing a'small amount of water torun through the valve while boring the seat and flushing valve aftersealing, to prevent lodgment of cutting material between valve and seat.

detached portion, including the cutting edge 1 as of Fig. 4, the pilot b1 and shoulder a! may be mounted in a machine tool holder and used to seat the valves. V

' The shank-2 has itssplit portion 4 spread sufficiently to insure .a snugnfitand is inserted into a threaded hole usually provided forthe ordinary valve retaining-screw used in the-ordinary valve assembly. However; a smooth hole to retain the splitshank-L can be! used innew production if preferred. i

- The valve: I of Fig. 3 maybe made using a sleeve 3. flanged .at bot-bends and without the may be substituted, as the shank 2 maybe removed. by cutting away the material over the head. a4: screw for the shank 2. 4 Since the valve! is pivotally mounted on stem D the picture between the valve l and seat portion aa'l which should be made two to five thousandth of an'inch smaller than the valve I, is greater than that erected between the wall of the hole in stem D and the split shank 2. Therefore, the shank 2 will turn more easily in its hole, and the valve I be held stationary while the stem D is turned in stem D thus minimizing Wear on the valve I. The greater the fluid pressure against the concavity, formed by the. projecting edge of valve l the tighter will be the sealing efiect against the wall of the seat bore.

. Having described my invention, the structure and applicationthereoiZI claim:

I m: For manufacturing, a tool approximating the 1. .A valveseating method consisting of shaping a valve seat inthe form of several cylindrical bores forming steps, at least one step rounded at V I its leading edge adapted to act as a centralizing and substituting a medium to guide a valve member made of flexible material capable of being expanded by pressure exerted against the face and periphery thereof,

.thestepformed by a smaller boreadapted tolimit thedepth to which a valve member could beim serted into a preceding larger bore. 1 o

2. A valve seat shaping tool having a cutting edge formed in a series of steps at least one step rounded to form a guide medium for a valve, the distal end of said; tool extended toform .a pilot, said tool having a shank, a conical guide slidable on said shank and cooperable with said pilot to guide said tool and holdsame in true operative alignment.

JESSE D. LANGDON. i 

